Studies on the Lead System for Telemetering of Exercise Electrocardiogram

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Abstract
To find an adequate lead for recording the electrocardiogram during exercise, 6 modifications of Frank''s Y-lead were studied. Factors examined were the phase difference, the voltage, the wave form as cardiac factors and the interference by electrical activity of the muscle and the influence of respiration as non cardiac factors. The study in 34 cases without marked intraventricular conduction disturbance indicated that the lead, in which a positive electrode at the height of the umbilicus and a negative one is placed in the subclavicular region along the right mid-clavicular line, is recommended. In practice, electrodes by Frank''s lead system and other 2 extra-electrodes by the modified lead are placed. The amplification of the modified lead is adjusted to the amplitude of the original one. With this method, records electrically equivalent to those by Frank''s lead system can be taken with little interference.

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